Copper alloy



per, 19.5% of nickel, and 0.5% of beryllium and 0.25% of manganese.

I No Drawing.

Patented Apr. 25, 1933 UNITED STATES PATENT OFFICE- Joszrn mm smn, or DETROI'LVMIOHIGAN, lAssIGuon. 'ro BEnYLLIim DEVELOP- umq'r cOnrOnA'rIoN, OF NEW YORK, N. Y., A CORPORATION or DELAWARE COPPER ALLOY Application filed December 22, 1931'. Serial n. 582,862.

This invention relates to alloysfof' great 1 strength, extreme toughness, and resistance to corrosion, such alloys being particularly suitable for condenser tubes and similar uses where somewhat elevated temperatures are involved. I Y

The alloys of my invention re resent a. copper base, copper comprising at east and no more than of the totaL- The other major element present is nickel, which comprises the greater portion of the remainder of the alloy. The alloys of the series differ from standard copper-nickel typesin that they contain relatively small, but nevertheless very important, percentages of beryllium and manganese. The content of each of these last two metals should be at least 0.1% and no greater than 2% of the total weight of the alloy, preferably with more beryllium than manganese. v

In addition to the four elements present as listed above, there will inevitably also be present impurities arising out of the constituent metals, such as iron, etc.; such impurities should, however, not exceed 0.5% in total.

As an example of my invention, I can cite an alloy comprised as follows:

Per cent Copper 79.5 Nickel 19.5 Beryllium- 0.5 Manganese 0.25 Constituent impurities 0.25

This alloy is particularly well adapted for condenser tube use and for similar utilization where the above mentioned factors of strength and resistance to corrosion are vital.

The percentages are by weight.

I claim:

1. An alloy approximately consisting of copper 70 to 90%, nickel 10 to 30%, beryllium 0.1 to 2.0%, and manganese 0.1 to 2.0%.

2. An alloy approximating 79.5% of cop- In testimony signed my name.

JOSEPH KENT SMITH.

whereof I have hereunto 

